US Environmental Protection Agency Method 314.1, an automated sample preconcentration/matrix elimination suppressed conductivity method for the analysis of trace levels (0.50 microg/L) of perchlorate in drinking water

Journal of Chromatography. a
Herbert P WagnerD J Munch

Abstract

Since 1997 there has been increasing interest in the development of analytical methods for the analysis of perchlorate. The US Environmental Protection Agency (EPA) Method 314.0, which was used during the first Unregulated Contaminant Monitoring Regulation (UCMR) cycle, supports a method reporting limit (MRL) of 4.0 microg/L. The non-selective nature of conductivity detection, combined with very high ionic strength matrices, can create conditions that make the determination of perchlorate difficult. The objective of this work was to develop an automated, suppressed conductivity method with improved sensitivity for use in the second UCMR cycle. The new method, EPA Method 314.1, uses a 35 mm x 4 mm cryptand concentrator column in the sample loop position to concentrate perchlorate from a 2 mL sample volume, which is subsequently rinsed with 10 mM NaOH to remove interfering anions. The cryptand concentrator column is combined with a primary AS16 analytical column and a confirmation AS20 analytical column. Unique characteristics of the cryptand column allow perchlorate to be desorbed from the cryptand trap and refocused on the head of the guard column for subsequent separation and analysis. EPA Method 314.1 has a perchlorate lowest...Continue Reading

Citations

Nov 4, 2010·Archives of Environmental Contamination and Toxicology·Namguk HerYeomin Yoon
Jun 26, 2009·Environmental Geochemistry and Health·Mustafa Al Kuisi, Ahmad Abdel-Fattah
Sep 8, 2010·BMC Public Health·Thomas PaparrigopoulosYiannis Tountas
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Jan 27, 2016·Environmental Science and Pollution Research International·Junhao QinHuashou Li
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